An upper limit to the global SO2 abundance on Io

Details An upper limit to the global SO2 abundance on Io An upper limit to the global SO2 abundance on Io

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..308b&link_type=abstract

Nature, vol. 285, May 29, 1980, p. 308, 309. Research supported by the Science Research Council;

Computer Science

8

Abundance, Atmospheric Composition, Io, Satellite Atmospheres, Sulfur Dioxides, Ultraviolet Spectra, Iue, Near Ultraviolet Radiation, Reflectance, Ultraviolet Absorption, Voyager Project, Jupiter, Satellites, Io, Sulfur Dioxide, Abundance, Voyager 1, Iris, Volcanism, Temperature, Atmosphere, Models, Reflectivity, Frost, Wavelengths, Spectrum, Flux, Ultraviolet, Absorption, Iue, Oao, Radio Spectra, Comparisons, Bands

Scientific paper

An upper limit to the global abundance of SO2 gas in the atmosphere of Io has been derived from observations of near-UV reflectivity made from earth orbit. Spectra in the range 2900-3100 A were obtained by the long-wavelength spectrograph of the IUE, and compared with the convolved solar spectrum of Broadfoot (1972). From the apparent solar origin of all the spectral features, an upper limit of 0.008 cm atm was calculated for the abundance of SO2, which was confirmed by ratio spectra of Vesta. Discrepancies between the upper limit obtained and the detection of a column abundance of 0.2 cm atm by the Voyager 1 IRIS experiment have a number of possible explanations, the most likely of which is that the SO2 atmosphere in Io is patchy, being confined to regions over solid deposits and volcanic vents.

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